Php 如何使用截击删除recyclerview中的项目？
嗨，我已经通过链接回收视图和MYSQL PHP成功地插入了项目，但是删除项目仍然失败。您可以在客户端删除它，但我在PHP和MYSQL方面一直失败。我可以得到这个例子或代码的帮助吗 这是recyclerview适配器代码Php 如何使用截击删除recyclerview中的项目？,php,android,mysql,android-recyclerview,Php,Android,Mysql,Android Recyclerview,嗨，我已经通过链接回收视图和MYSQL PHP成功地插入了项目，但是删除项目仍然失败。您可以在客户端删除它，但我在PHP和MYSQL方面一直失败。我可以得到这个例子或代码的帮助吗 这是recyclerview适配器代码 public class CardAdapter extends RecyclerView.Adapter<CardAdapter.ViewHolder> { //Imageloader to load image private ImageLoad
public class CardAdapter extends RecyclerView.Adapter<CardAdapter.ViewHolder> {
//Imageloader to load image
private ImageLoader imageLoader;
private Context context;
//List to store all superheroes
List<recyclerview_list> recyclerview_lists;
//Constructor of this class
public CardAdapter(List<recyclerview_list> recyclerview_lists, recyclerview context) {
super();
//Getting all superheroes
this.recyclerview_lists = recyclerview_lists;
this.context = (Context) context;
}
@Override
public ViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
View v = LayoutInflater.from(parent.getContext())
.inflate(R.layout.recyclerview_list, parent, false);
ViewHolder viewHolder = new ViewHolder(v);
return viewHolder;
}
@Override
public void onBindViewHolder(ViewHolder holder, int position) {
//Getting the particular item from the list
recyclerview_list recyclerview_List = recyclerview_lists.get(position);
//Loading image from url
imageLoader = CustomVolleyRequest.getInstance(context).getImageLoader();
imageLoader.get(recyclerview_List.getImage_path(), ImageLoader.getImageListener(holder.imageView, R.drawable.ic_launcher_background, android.R.drawable.ic_dialog_alert));
//Showing data on the views
holder.imageView.setImageUrl(recyclerview_List.getImage_path(), imageLoader);
holder.textViewName.setText(recyclerview_List.getImage_name());
}
@Override
public int getItemCount() {
return recyclerview_lists.size();
}
class ViewHolder extends RecyclerView.ViewHolder {
//Views
public NetworkImageView imageView;
public TextView textViewName;
public Button deleteButton;
//Initializing Views
public ViewHolder(final View itemView) {
super(itemView);
imageView = (NetworkImageView) itemView.findViewById(R.id.imageViewHero);
textViewName = (TextView) itemView.findViewById(R.id.textViewName);
deleteButton = (Button) itemView.findViewById(R.id.buttonDelete);
deleteButton.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
Toast.makeText(context, "Delete", Toast.LENGTH_SHORT).show();
delete(getAdapterPosition());
}
});
}
public void delete(int position) {
try {
recyclerview_lists.remove(position);
notifyItemRemoved(position);
} catch (IndexOutOfBoundsException ex) {
ex.printStackTrace();
}
}
}
}
在适配器调用中添加新方法
public void deleteFromServer(int id)
{
url = "http://yoururl/delete_image.php";
StringRequest postRequest = new StringRequest(Request.Method.POST, url,
new Response.Listener<String>()
{
@Override
public void onResponse(String response) {
// if success
delete(id)
Log.d("Response", response);
}
},
new Response.ErrorListener()
{
@Override
public void onErrorResponse(VolleyError error) {
// error
Log.d("Error.Response", response);
}
}
) {
@Override
protected Map<String, String> getParams()
{
Map<String, String> params = new HashMap<String, String>();
params.put("id", id);
return params;
}
};
queue.add(postRequest);
}
很好的代码，但无法获取识别的id。我将分享我的全部工作 Config.java
public static final String DATA_URL = "http:// /images/feed.php?page=";
/*Json으로 가져오는 이미지 테이블의 목록*/
// 이미지 주소
public static final String TAG_IMAGE_URL = "image_path";
// 이미지 이름
public static final String TAG_NAME = "image_name";
private static CustomVolleyRequest customVolleyRequest;
private static Context context;
private RequestQueue requestQueue;
private ImageLoader imageLoader;
private CustomVolleyRequest(Context context) {
this.context = context;
this.requestQueue = getRequestQueue();
imageLoader = new ImageLoader(requestQueue,
new ImageLoader.ImageCache() {
private final LruCache<String, Bitmap>
cache = new LruCache<String, Bitmap>(20);
@Override
public Bitmap getBitmap(String url) {
return cache.get(url);
}
@Override
public void putBitmap(String url, Bitmap bitmap) {
cache.put(url, bitmap);
}
});
}
public static synchronized CustomVolleyRequest getInstance(Context context) {
if (customVolleyRequest == null) {
customVolleyRequest = new CustomVolleyRequest(context);
}
return customVolleyRequest;
}
public RequestQueue getRequestQueue() {
if (requestQueue == null) {
Cache cache = new DiskBasedCache(context.getCacheDir(), 10 * 1024 * 1024);
Network network = new BasicNetwork(new HurlStack());
requestQueue = new RequestQueue(cache, network);
requestQueue.start();
}
return requestQueue;
}
public ImageLoader getImageLoader() {
return imageLoader;
}
//Creating Views
private RecyclerView recyclerView;
private RecyclerView.LayoutManager layoutManager;
private RecyclerView.Adapter adapter;
//Volley Request Queue
private RequestQueue requestQueue;
//The request counter to send ?page=1, ?page=2 requests
private int requestCount = 1;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_recyclerview);
//Initializing Views
recyclerView = (RecyclerView) findViewById(R.id.recyclerView);
recyclerView.setHasFixedSize(true);
layoutManager = new LinearLayoutManager(this);
recyclerView.setLayoutManager(layoutManager);
//Initializing our superheroes list
listSuperHeroes = new ArrayList<>();
requestQueue = Volley.newRequestQueue(this);
//Calling method to get data to fetch data
getData();
//Adding an scroll change listener to recyclerview
recyclerView.setOnScrollChangeListener(this);
//initializing our adapter
adapter = new CardAdapter(listSuperHeroes ,this);
//Adding adapter to recyclerview
recyclerView.setAdapter(adapter);
}
//Request to get json from server we are passing an integer here
//This integer will used to specify the page number for the request ?page = requestcount
//This method would return a JsonArrayRequest that will be added to the request queue
private JsonArrayRequest getDataFromServer(int requestCount) {
//Initializing ProgressBar
final ProgressBar progressBar = (ProgressBar) findViewById(R.id.progressBar1);
//Displaying Progressbar
progressBar.setVisibility(View.VISIBLE);
setProgressBarIndeterminateVisibility(true);
//JsonArrayRequest of volley
JsonArrayRequest jsonArrayRequest = new JsonArrayRequest(Config.DATA_URL + String.valueOf(requestCount),
new Response.Listener<JSONArray>() {
@Override
public void onResponse(JSONArray response) {
//Calling method parseData to parse the json response
parseData(response);
//Hiding the progressbar
progressBar.setVisibility(View.GONE);
}
},
new Response.ErrorListener() {
@Override
public void onErrorResponse(VolleyError error) {
progressBar.setVisibility(View.GONE);
//If an error occurs that means end of the list has reached
Toast.makeText(recyclerview.this, "No More Items Available", Toast.LENGTH_SHORT).show();
}
});
//Returning the request
return jsonArrayRequest;
}
//This method will get data from the web api
private void getData() {
//Adding the method to the queue by calling the method getDataFromServer
requestQueue.add(getDataFromServer(requestCount));
//Incrementing the request counter
requestCount++;
}
//This method will parse json data
private void parseData(JSONArray array) {
for (int i = 0; i < array.length(); i++) {
//Creating the superhero object
recyclerview_list recyclerviewList = new recyclerview_list();
JSONObject json = null;
try {
//Getting json
json = array.getJSONObject(i);
//Adding data to the superhero object
recyclerviewList.setImage_path(json.getString(Config.TAG_IMAGE_URL));
recyclerviewList.setImage_name(json.getString(Config.TAG_NAME));
} catch (JSONException e) {
e.printStackTrace();
}
//Adding the superhero object to the list
listSuperHeroes.add(recyclerviewList);
}
//Notifying the adapter that data has been added or changed
adapter.notifyDataSetChanged();
}
//This method would check that the recyclerview scroll has reached the bottom or not
private boolean isLastItemDisplaying(RecyclerView recyclerView) {
if (recyclerView.getAdapter().getItemCount() != 0) {
int lastVisibleItemPosition = ((LinearLayoutManager) recyclerView.getLayoutManager()).findLastCompletelyVisibleItemPosition();
if (lastVisibleItemPosition != RecyclerView.NO_POSITION && lastVisibleItemPosition == recyclerView.getAdapter().getItemCount() - 1)
return true;
}
return false;
}
//Overriden method to detect scrolling
@Override
public void onScrollChange(View v, int scrollX, int scrollY, int oldScrollX, int oldScrollY) {
//Ifscrolled at last then
if (isLastItemDisplaying(recyclerView)) {
//Calling the method getdata again
getData();
}
}
//创建视图
私人回收站；
private RecyclerView.LayoutManager LayoutManager；
专用循环视图适配器；
//截击请求队列
私有请求队列请求队列；
//发送请求的请求计数器？page=1，？page=2请求
private int requestCount=1；
@凌驾
创建时受保护的void（Bundle savedInstanceState）{
super.onCreate（savedInstanceState）；
setContentView（R.layout.activity\u recyclerview）；
//初始化视图
recyclerView=（recyclerView）findViewById（R.id.recyclerView）；
recyclerView.setHasFixedSize（true）；
layoutManager=新的LinearLayoutManager（此）；
recyclerView.setLayoutManager（layoutManager）；
//正在初始化我们的超级英雄列表
ListSuperheros=newArrayList（）；
requestQueue=Volley.newRequestQueue（this）；
//调用方法获取数据以获取数据
getData（）；
//向recyclerview添加滚动更改侦听器
recyclerView.setOnScrollChangeListener（此）；
//初始化适配器
适配器=新的CardAdapter（列表超级英雄，此）；
//向recyclerview添加适配器
recyclerView.setAdapter（适配器）；
}
//请求从服务器获取json我们在这里传递一个整数
//此整数将用于指定请求的页码？page=requestcount
//此方法将返回将添加到请求队列的JsonArrayRequest
私有JsonArrayRequest getDataFromServer（int requestCount）{
//初始化进度条
最终ProgressBar ProgressBar=（ProgressBar）findViewById（R.id.progressBar1）；
//显示进度条
progressBar.setVisibility（View.VISIBLE）；
SetProgressBarInDeterminateVibility（真）；
//JsonArrayRequest截击
JsonArrayRequest JsonArrayRequest=新的JsonArrayRequest（Config.DATA\u URL+String.valueOf（requestCount），
新的Response.Listener（）{
@凌驾
公共void onResponse（JSONArray响应）{
//调用parseData方法来解析json响应
解析数据（响应）；
//隐藏进度条
progressBar.setVisibility（View.GONE）；
}
},
新的Response.ErrorListener（）{
@凌驾
公共无效onErrorResponse（截击错误）{
progressBar.setVisibility（View.GONE）；
//若发生错误，则表示已到达列表末尾
Toast.makeText（recyclerview.this，“没有更多可用项”，Toast.LENGTH_SHORT.show（）；
}
});
//返回请求
返回jsonArrayRequest；
}
//此方法将从web api获取数据
私有void getData（）{
//通过调用getDataFromServer方法将该方法添加到队列
add（getDataFromServer（requestCount））；
//递增请求计数器
requestCount++；
}
//此方法将解析json数据
私有void parseData（JSONArray数组）{
对于（int i=0；iprivate static CustomVolleyRequest customVolleyRequest;
private static Context context;
private RequestQueue requestQueue;
private ImageLoader imageLoader;
private CustomVolleyRequest(Context context) {
this.context = context;
this.requestQueue = getRequestQueue();
imageLoader = new ImageLoader(requestQueue,
new ImageLoader.ImageCache() {
private final LruCache<String, Bitmap>
cache = new LruCache<String, Bitmap>(20);
@Override
public Bitmap getBitmap(String url) {
return cache.get(url);
}
@Override
public void putBitmap(String url, Bitmap bitmap) {
cache.put(url, bitmap);
}
});
}
public static synchronized CustomVolleyRequest getInstance(Context context) {
if (customVolleyRequest == null) {
customVolleyRequest = new CustomVolleyRequest(context);
}
return customVolleyRequest;
}
public RequestQueue getRequestQueue() {
if (requestQueue == null) {
Cache cache = new DiskBasedCache(context.getCacheDir(), 10 * 1024 * 1024);
Network network = new BasicNetwork(new HurlStack());
requestQueue = new RequestQueue(cache, network);
requestQueue.start();
}
return requestQueue;
}
public ImageLoader getImageLoader() {
return imageLoader;
}
private String image_path;
private String image_name;
public String getImage_path() {
return image_path;
}
public void setImage_path(String image_path) {
this.image_path = image_path;
}
public String getImage_name() {
return image_name;
}
public void setImage_name(String image_name) {
this.image_name = image_name;
}
//Creating Views
private RecyclerView recyclerView;
private RecyclerView.LayoutManager layoutManager;
private RecyclerView.Adapter adapter;
//Volley Request Queue
private RequestQueue requestQueue;
//The request counter to send ?page=1, ?page=2 requests
private int requestCount = 1;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_recyclerview);
//Initializing Views
recyclerView = (RecyclerView) findViewById(R.id.recyclerView);
recyclerView.setHasFixedSize(true);
layoutManager = new LinearLayoutManager(this);
recyclerView.setLayoutManager(layoutManager);
//Initializing our superheroes list
listSuperHeroes = new ArrayList<>();
requestQueue = Volley.newRequestQueue(this);
//Calling method to get data to fetch data
getData();
//Adding an scroll change listener to recyclerview
recyclerView.setOnScrollChangeListener(this);
//initializing our adapter
adapter = new CardAdapter(listSuperHeroes ,this);
//Adding adapter to recyclerview
recyclerView.setAdapter(adapter);
}
//Request to get json from server we are passing an integer here
//This integer will used to specify the page number for the request ?page = requestcount
//This method would return a JsonArrayRequest that will be added to the request queue
private JsonArrayRequest getDataFromServer(int requestCount) {
//Initializing ProgressBar
final ProgressBar progressBar = (ProgressBar) findViewById(R.id.progressBar1);
//Displaying Progressbar
progressBar.setVisibility(View.VISIBLE);
setProgressBarIndeterminateVisibility(true);
//JsonArrayRequest of volley
JsonArrayRequest jsonArrayRequest = new JsonArrayRequest(Config.DATA_URL + String.valueOf(requestCount),
new Response.Listener<JSONArray>() {
@Override
public void onResponse(JSONArray response) {
//Calling method parseData to parse the json response
parseData(response);
//Hiding the progressbar
progressBar.setVisibility(View.GONE);
}
},
new Response.ErrorListener() {
@Override
public void onErrorResponse(VolleyError error) {
progressBar.setVisibility(View.GONE);
//If an error occurs that means end of the list has reached
Toast.makeText(recyclerview.this, "No More Items Available", Toast.LENGTH_SHORT).show();
}
});
//Returning the request
return jsonArrayRequest;
}
//This method will get data from the web api
private void getData() {
//Adding the method to the queue by calling the method getDataFromServer
requestQueue.add(getDataFromServer(requestCount));
//Incrementing the request counter
requestCount++;
}
//This method will parse json data
private void parseData(JSONArray array) {
for (int i = 0; i < array.length(); i++) {
//Creating the superhero object
recyclerview_list recyclerviewList = new recyclerview_list();
JSONObject json = null;
try {
//Getting json
json = array.getJSONObject(i);
//Adding data to the superhero object
recyclerviewList.setImage_path(json.getString(Config.TAG_IMAGE_URL));
recyclerviewList.setImage_name(json.getString(Config.TAG_NAME));
} catch (JSONException e) {
e.printStackTrace();
}
//Adding the superhero object to the list
listSuperHeroes.add(recyclerviewList);
}
//Notifying the adapter that data has been added or changed
adapter.notifyDataSetChanged();
}
//This method would check that the recyclerview scroll has reached the bottom or not
private boolean isLastItemDisplaying(RecyclerView recyclerView) {
if (recyclerView.getAdapter().getItemCount() != 0) {
int lastVisibleItemPosition = ((LinearLayoutManager) recyclerView.getLayoutManager()).findLastCompletelyVisibleItemPosition();
if (lastVisibleItemPosition != RecyclerView.NO_POSITION && lastVisibleItemPosition == recyclerView.getAdapter().getItemCount() - 1)
return true;
}
return false;
}
//Overriden method to detect scrolling
@Override
public void onScrollChange(View v, int scrollX, int scrollY, int oldScrollX, int oldScrollY) {
//Ifscrolled at last then
if (isLastItemDisplaying(recyclerView)) {
//Calling the method getdata again
getData();
}
}